Oral thermometer



FIG. 1 is a top and left-front perspective view of an oral thermometer showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left end elevational view thereof;

FIG. 6 is a right end elevational view thereof. 

The ornamental design for an oral thermometer, as shown and described. 